单击包含在片段中的回收器视图中的项目以使用传递的数据打开新活动

Question

我有一个MainActivity和三个片段，其中包含recyclerViews，recyclerViews包含两个文本视图，我希望用户单击recyclerview，中的文本应传递给新活动，我有点新，因此如果您能给我详细的代码和一些解释，我将不胜感激。

我想点击recyclerview中的一个项目，它应该打开一个新的活动，数据（文本）应该从recyclerview传递到新的活动。

这是我的HymnModel.java代码

public class HymnModel {

String title;
String song;


HymnModel(String title, String song){
    this.title=title;
    this.song=song;
}

public String getTitle() {return title;
}

public String getSong() {
    return song;
}
}

这是itemviewholder的代码。Java语言

import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.TextView;
import com.tutorialsbuzz.recyclerview.R;

public class ItemViewHolder extends RecyclerView.ViewHolder {

public TextView title_textview;
public TextView song_textview;



public ItemViewHolder(View itemView) {
    super(itemView);
    itemView.setClickable(true);
    title_textview = (TextView) itemView.findViewById(R.id.song_title);
    song_textview = (TextView) itemView.findViewById(R.id.song);

}

public void bind(HymnModel hymnModel) {
    title_textview.setText(hymnModel.getTitle());
    song_textview.setText(hymnModel.getSong());

}


}

这是我的适配器类

import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.tutorialsbuzz.recyclerview.R;
import java.util.ArrayList;
import java.util.List;

public class RVAdapter extends RecyclerView.Adapter<ItemViewHolder> {

private List<HymnModel> mCountryModel;
private List<HymnModel> mOriginalCountryModel;

public RVAdapter(List<HymnModel> mCountryModel) {
    this.mCountryModel = mCountryModel;
    this.mOriginalCountryModel = mCountryModel;
}

@Override
public void onBindViewHolder(ItemViewHolder itemViewHolder, int i) {
    final HymnModel model = mCountryModel.get(i);
    itemViewHolder.bind(model);
}

@Override
public ItemViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
    View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_row, viewGroup, false);
    return new ItemViewHolder(view);
}

@Override
public int getItemCount() {
    return mCountryModel.size();
}

public void setFilter(List<HymnModel> countryModels){
    mCountryModel = new ArrayList<>();
    mCountryModel.addAll(countryModels);
    notifyDataSetChanged();
}

 }

这是我的一个片段的代码

public class TabOneFragment extends Fragment implements SearchView.OnQueryTextListener {

private RecyclerView recyclerview;
private List<HymnModel> mHymnModel;
private RVAdapter adapter;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

    View view = inflater.inflate(R.layout.tab_one_fragment, container, false);

    recyclerview = (RecyclerView) view.findViewById(R.id.recyclerview);
    LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
    recyclerview.setLayoutManager(layoutManager);

    return view;
}


@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    setHasOptionsMenu(true);
    int numOfSongs = 32;


    DisplayMetrics metrics = new DisplayMetrics();
    getActivity().getWindowManager().getDefaultDisplay().getMetrics(metrics);

    int height = metrics.heightPixels;
    int width = metrics.widthPixels;

    String [] titles = {HymnTitles.hymnTitle1, HymnTitles.hymnTitle2, HymnTitles.hymnTitle3, HymnTitles.hymnTitle4, HymnTitles.hymnTitle5,
            HymnTitles.hymnTitle6, HymnTitles.hymnTitle7, HymnTitles.hymnTitle8, HymnTitles.hymnTitle9, HymnTitles.hymnTitle10, HymnTitles.hymnTitle11,
            HymnTitles.hymnTitle12};

    String [] songs = {Hymns.hymn1.substring(width/5), Hymns.hymn2, Hymns.hymn3, Hymns.hymn4, Hymns.hymn5, Hymns.hymn6, Hymns.hymn7, Hymns.hymn8, Hymns.hymn9, Hymns.hymn10, Hymns.hymn11, Hymns.hymn12};

    mHymnModel = new ArrayList<>();



    for (int i = 0; i < titles.length; i++) {
        mHymnModel.add(new HymnModel(i + "." + " " + titles[i], "  " + songs[i]));
    }

    adapter = new RVAdapter(mHymnModel);
    recyclerview.setAdapter(adapter);
}


@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    inflater.inflate(R.menu.menu_main, menu);

    final MenuItem item = menu.findItem(R.id.action_search);
    final SearchView searchView = (SearchView) MenuItemCompat.getActionView(item);
    searchView.setOnQueryTextListener(this);

    MenuItemCompat.setOnActionExpandListener(item,
            new MenuItemCompat.OnActionExpandListener() {
                @Override
                public boolean onMenuItemActionCollapse(MenuItem item) {
                    // Do something when collapsed
                    adapter.setFilter(mHymnModel);
                    return true; // Return true to collapse action view
                }

                @Override
                public boolean onMenuItemActionExpand(MenuItem item) {
                    // Do something when expanded
                    return true; // Return true to expand action view
                }
            });
}

@Override
public boolean onQueryTextChange(String newText) {
    final List<HymnModel> filteredModelList = filter(mHymnModel, newText);
    adapter.setFilter(filteredModelList);
    return true;
}

@Override
public boolean onQueryTextSubmit(String query) {
    return false;
}


private List<HymnModel> filter(List<HymnModel> models, String query) {
    query = query.toLowerCase();

    final List<HymnModel> filteredModelList = new ArrayList<>();
    for (HymnModel model : models) {
        final String text = model.getSong().toLowerCase();
        if (text.contains(query)) {
            filteredModelList.add(model);
        }
    }
    return filteredModelList;
}

 }

我的主要活动

public class MainActivity extends AppCompatActivity {

private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;

private int[] tabIcons = {
        R.drawable.ic_action_person,
        R.drawable.ic_action_group,
        R.drawable.ic_action_call
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    ActionBar actionBar = getSupportActionBar();

    actionBar.setDisplayHomeAsUpEnabled(true);


    viewPager = (ViewPager) findViewById(R.id.viewpager);
    setupViewPager(viewPager);

    tabLayout = (TabLayout) findViewById(R.id.tablayout);
    tabLayout.setupWithViewPager(viewPager);

}

private void setupViewPager(ViewPager viewPager) {
    ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
    adapter.addFragment(new TabOneFragment(), "Tab 1");
    adapter.addFragment(new TabTwoFragment(), "Tab 2");
    adapter.addFragment(new TabThreeFragment(), "Tab 3");
    viewPager.setAdapter(adapter);

}


}

最后是我的ViewPageAdapter

   public class ViewPagerAdapter extends FragmentStatePagerAdapter {

    private final List<Fragment> mFragmentList = new ArrayList<>();
    private final List<String> mFragmentTitleList = new ArrayList<>();

    public ViewPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        return mFragmentList.get(position);
    }

    @Override
    public int getCount() {
        return mFragmentList.size();
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return mFragmentTitleList.get(position);
    }

    public void addFragment(Fragment fragment, String title) {
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);
    }
}

谢谢你。

Answer 1

您好首先，您总是希望从活动或片段开始您的活动。切勿从适配器启动。

所以在你的适配器构造函数中添加这个

public AdapterName(......,Context context){
...your code.
this.mContext=context;
}

在那里传递上下文。

而不是在这个方法里面

public ItemViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {

view.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {
        if(mContext instanceof YourActivityName){
            ((YourActivityName)mContext).yourDesiredMethod();
        }
    }
});

Answer 2

>

创建接口

public interface OnHymnClickListener {
    void onHymnClick(HymnModel hymnModel);
}

将侦听器传递给适配器

public class RVAdapter extends RecyclerView.Adapter<ItemViewHolder> {
    private OnHymnClickListener listener;

    public void setListener(OnHymnClickListener listener) {
        this.listener = listener;
    }

    @Override
    public void onBindViewHolder(ItemViewHolder itemViewHolder, int i) {
        final HymnModel model = mCountryModel.get(i);
        itemViewHolder.bind(model);
        itemViewHolder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(listener != null) {
                    listener.onHymnClick(model);
                }
            }
        });
    }
}

让你的片段去实现它

public class TabOneFragment extends Fragment implements SearchView.OnQueryTextListener, OnHymnClickListener {

    @Override
    public void onHymnClick(HymnModel hymnModel) {
        //put data to bundle and startActivity
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        adapter = new RVAdapter(mHymnModel);
        adapter.setListener(this);
        recyclerview.setAdapter(adapter);
    }
}